EP 0111120 A3 19851204 - PROCESS FOR THE PREPARATION OF ANTHRAQUINONES
Title (en)
PROCESS FOR THE PREPARATION OF ANTHRAQUINONES
Publication
Application
Priority
DE 3241449 A 19821110
Abstract (en)
[origin: EP0111120A2] 1. A process for the preparation of an anthraquinone of the formula I see diagramm : EP0111120,P5,F1 where the individual radicals X may be identical or different and each denotes a halogen or hydrogen atom, by oxidation of a diphenylmethane compound at elevated temperature, wherein an (o-dihalomethyl)-diphenyldihalomethane compound of the formula II see diagramm : EP0111120,P5,F2 where X has the above meanings, and the individual radicals Y may be identical or different and each denotes a halogen atom, is oxidized with nitric acid in the presence of sulphuric acid.
IPC 1-7
IPC 8 full level
C07C 46/02 (2006.01); C07C 50/18 (2006.01); C07C 50/24 (2006.01)
CPC (source: EP)
C07C 46/02 (2013.01); C07C 50/24 (2013.01)
Citation (search report)
- [A] GB 2013664 A 19790815 - BERGWERKSVERBAND GMBH
- [A] DE 2031430 A1 19720210
- [A] GB 394990 A 19330629 - IG FARBENINDUSTRIE AG
- [A] CHEMICAL ABSTRACTS, Band 50, Nr. 6, 25. März 1956, Spalte 4080 h-i, Columbus, Ohio, US; E. BENGTSSON: "Oxidation of diphenylmethane and benzyltoluene with dilute nitric acid at high temperature and pressure", & ACTA CHEM. SCAND. 9, 177-8(1955)
Designated contracting state (EPC)
BE CH DE FR GB IT LI
DOCDB simple family (publication)
EP 0111120 A2 19840620; EP 0111120 A3 19851204; EP 0111120 B1 19861217; DE 3241449 A1 19840510; DE 3368405 D1 19870129
DOCDB simple family (application)
EP 83110593 A 19831024; DE 3241449 A 19821110; DE 3368405 T 19831024